package com.tzsp.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.tzsp.reggie.commons.contans.R;
import com.tzsp.reggie.commons.utils.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检测用户是否登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}",request.getRequestURI());
        //1、获取本次请求的url
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls= new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg",
                "/user/loginout"
        };

        //2、判断请求是否需要处理
        Boolean checkRequest = checkRequest(urls, requestURI);

        //3、如果不需要处理-直接放行
        if (checkRequest){
            log.info("本次请求{}，不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1、判断登录状态，已经登录，-放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("user"));
            Long id = Thread.currentThread().getId();
            log.info("线程id：{}",id);
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        //4-2、判断登录状态，已经登录，-放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("employee"));
            Long id = Thread.currentThread().getId();
            log.info("线程id：{}",id);
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录的结果，通过输出流的方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));



        return;


    }

    /**
     * 检测本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public Boolean checkRequest(String[] urls,String requestURI){
        for (String url:urls){
            //判断二者是否相等
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
